Nuclear Power Engineering
Nuclear fuel generally used in reactors is uranium oxide instead of uranium, because the former has higher

Density ; hence core volume for a given power output would be smaller
Melting point, hence can be subjected to higher temperature
All of these
Resistance to effects of irradiation

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Nuclear Power Engineering
The main purpose of control rod in a nuclear reactor is to control the

Emission of hazardous radiation
Conversion of fissile material into fertile material
Chain reaction and hence the power output by regulating the number of secondary neutrons causing fission
Velocity of the secondary neutrons

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